fix: memory

app/react/components/particle-worker.js

@@ -17,19 +17,41 @@ addEventListener('message', (particle) => {
     .onEnd(() => {});
 });
 
+const memory = new Set();
+
 let last = performance.now();
 function tick(now) {
   const elapsed = (now - last) / 1000;
   last = now;
-  if (ecs.get(1)) {
-    ecs.tick(elapsed);
-    emitter.tick(elapsed);
-    if ('1' in ecs.diff) {
-      delete ecs.diff['1'];
-    }
-    postMessage(ecs.diff);
-    ecs.setClean();
-  }
   requestAnimationFrame(tick);
+  if (!ecs.get(1)) {
+    return;
+  }
+  ecs.tick(elapsed);
+  emitter.tick(elapsed);
+  const update = {};
+  const lastNearby = new Set(memory.values());
+  for (const id in ecs.$$entities) {
+    const entity = ecs.$$entities[id];
+    lastNearby.delete(id);
+    if (!memory.has(id)) {
+      update[id] = entity.toJSON();
+    }
+    else if (ecs.diff[id]) {
+      update[id] = ecs.diff[id];
+    }
+    memory.add(id);
+  }
+  for (const id of lastNearby) {
+    memory.delete(id);
+    update[id] = false;
+  }
+  if ('1' in update) {
+    delete update['1'];
+  }
+  if (Object.keys(update).length > 0) {
+    postMessage(update);
+  }
+  ecs.setClean();
 }
 requestAnimationFrame(tick);